Effect of Rotation on a Gas Turbine Blade Internal Cooling System: Experimental Investigation

Massini, Daniele; Burberi, Emanuele; Carcasci, Carlo; Cocchi, Lorenzo; Facchini, Bruno; Armellini, Alessandro; Casarsa, Luca; Furlani, Luca

doi:10.1115/gt2016-57594

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…The use of TLC in temperature measurements has been employed in different places in literature [7,9,15]. Each type of liquid crystal has a different temperature range, which is termed as a wideband.…”

Section: The Tlc Techniquementioning

confidence: 99%

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Numerical Analysis and Experimental Validation of the Jet Impingement Cooling of a Turbine-Blade Leading Edge at Different Rotation Speeds

Safi

Hamdan

Omari

et al. 2023

Preprint

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Herein, experimental and numerical validation studies were conducted on internal channel cooling in which seven jets impinging inside a rotating semi-cylindrical channel. These studies were conducted by considering a Reynolds number of 7,500 for a jet at five rotation speeds (ranging from 0 to 200 rpm). Numerical analysis was performed using the shear stress transport (SST) k–ω turbulence model with a properly analyzed fine mesh containing eight million nodes. A test setup with required instrumentation was developed inhouse for this study. Two temperature measurement techniques, namely thermochromic liquid crystals (TLCs) and thermocouples, were adopted. Further, the target surface temperature contours were precisely analyzed by comparing the TLC temperature measurements with the numerical temperature results. The captured temperature contours indicated points of minimum-temperature regions, which corresponded to the jet impingement regions. By examining the temperature distribution along the axial centerline, a good agreement was established between the numerical results and the experimental measurements. For Reynolds number of 7,500, increasing ration speed from 0 to 250 rpm has reduced the variation in temperature between different jets. The size of inlet port to feeding duct has a strong imapact on jet formation, which led to different mass flow rate across jets. Furthermore, a small deviation between numerical and experimental data can be observed near the end side of the channel owing to the radial and lateral heat transfer losses and outlet flow restriction.

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Section: The Tlc Techniquementioning

confidence: 99%

“…Burberi et al [14] and Massini et al [15] experimentally and numerically investigated the effect of rotation on the jet impingement heat transfer with respect to the leading edge of the gas turbine blade. The Reynolds number of the jet varied from 10,000 to 40,000, and the rotation number of the jet (Roj) varied from 0 to 0.05.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Experimental Validation of the Jet Impingement Cooling of a Turbine-Blade Leading Edge at Different Rotation Speeds

Safi

Hamdan

Omari

et al. 2023

Preprint

View full text Add to dashboard Cite

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Effect of Rotation on a Gas Turbine Blade Internal Cooling System: Numerical Investigation

Massini

Burberi

Carcasci

et al. 2016

Journal of Turbomachinery

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Increasing turbine inlet temperature is one of the main strategies used to accomplish the demand for increased performance of modern gas turbines. Thus, optimization of the cooling system is becoming of paramount importance in gas turbine development. Leading edge (LE) represents a critical part of cooled nozzles and blades, given the presence of the hot gases stagnation point, and the unfavorable geometrical characteristics for cooling purposes. This paper reports the results of a numerical investigation, carried out to support a parallel experimental campaign, aimed at assessing the rotation effects on the internal heat transfer coefficient (HTC) distribution in a realistic LE cooling system of a high pressure blade. Experiments were performed in static and rotating conditions replicating a typical range of jet Reynolds number (10,000–40,000) and Rotation number (0–0.05). The experimental results consist of flowfield measurements on several internal planes and HTC distributions on the LE internal surface. Hybrid RANS–large eddy simulation (LES) models were exploited for the simulations, such as scale adaptive simulation and detached eddy simulation, given their ability to resolve the complex flowfield associated with jet impingement. Numerical flowfield results are reported in terms of both jet velocity profiles and 2D vector plots on two internal planes, while the HTC distributions are presented as detailed 2D maps together with averaged Nusselt number profiles. A fairly good agreement with experiments is observed, which represents a validation of the adopted modeling strategy, allowing an in-depth interpretation of the experimental results.

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Effect of Rotation on a Gas Turbine Blade Internal Cooling System: Experimental Investigation

Cited by 2 publications

References 32 publications

Numerical Analysis and Experimental Validation of the Jet Impingement Cooling of a Turbine-Blade Leading Edge at Different Rotation Speeds

Numerical Analysis and Experimental Validation of the Jet Impingement Cooling of a Turbine-Blade Leading Edge at Different Rotation Speeds

Effect of Rotation on a Gas Turbine Blade Internal Cooling System: Numerical Investigation

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